Just thought I’d add here, I ported a more specific version of the Grove 128x64 OLED Display library that uses Seeedstudio’s more lightweight library, if you don’t need all the functions that come with Adafruit_GFX.
In the Particle IDE it’s called Grove_OLED_128x64. It can also be found at https://github.com/esimkowitz/Particle-Grove-OLED.